Shuttle for weaving looms



g- 1929: F. KRUMPER 1,725,30

SHUTTLE FOR WEAVING LOOMS File ly 1928 2 Sheets-Sheet 1 Inner: for

Aug. 27, 1929. F. KRUMPER 1,725,804

SHUTTLE F 'OR WEAYING LOOMS Fil uly 1928 2 Sheets-Sheet 2 J I 7 'a u,

Inventor Wad 4 fi'r mwm m Patented Aug. 2?, 1929.

warren STATES PATENT OFFICE.

FRIEDRICH. KRUMTER, OF HOHENEMS, AUSTRIA.

SHUTTLE FOR WEAVTNQ- LOOMS.

Application filed July 11, 1928, Serial. No. 291.981, and in Switzerland Iuly 15, 1927.

The known shuttle carried devices for severing a weft thread and thereby preventing a flaw in the weave which occurs when a warp thread slacks and a narrowing of the shed takes place, present the disadvantage that they are let into action only by parts of the narrowed shed which act on the'shuttle from above whilst close observation has shown that also parts of the narrowed shed which bear on the shuttle from below may be the cause of flaws.

The subject matter of the present invention is a device for automatically preventing the formation of flaw-s, having a member adapted to be released by a slack warp thread and causing a clamping or breaking of the weft thread, whereby depressions in the body of the shuttle into which the releasing member projects are arranged not only on the upper side of the shuttle but also on the lower side of the latter for the purpose of causing a clamping or rupture of the weft thread when the slack warp thread bears on the upper or lower side of the shuttle.

Constructional examples of the subject matter of the present invention are illustrated on the accompanying drawings, in which:

Fig. 1 shows in a longitudinal section a first constructional example of'the improved shuttle,

Fig. 2 is a plan view of the shuttle shown in Fig. 1,

Fig. 3 is a section along line 3-3 in Fig. 1,

Figs. 4, 4 and 4 respectively show an elevation, edge view and plan view respectively of a clamping and cutting disk,

Fig. 5 shows on a larger scale and in a plan View a further detail,

Fig. 6 shows a second constructional example in which the shuttle is illustrated in a longitudinal section and the parts of the device partly in a side elevation and partly in section and in their position in readiness for operation,

Fig. 7 is a plan view of the device shown in Fig. 6,

Figs. 8 and 8 show in an elevation and plan view respectively a detail of the second constructional example,

Fig. 9 shows some parts of the second constructional example in an other operative position,

Figs. 10 and 10 show on a larger scale and in a side elevation and plan view respectively a detail of the second constructional example,

Fig. 11 shows on a larger scale and in a side elevation with parts illustrated in section a further detail of the second constructional example,

Fig. 12 shows in a plan view a third constructional example of the device arranged with an axial longitudinal slot arranged in the continuation of the well 22 serving to house the bobbin 21. The height of the slot varies and it extends from top to bottom of the shuttle only in the part 23. To the well 22 the part 25 of a slot lined with velvet 24 joins and with the part25 the part 26 of the slot communicates, the latter being somewhat narrower than the slot 25 and of the same width as the part 23 of the slot above which a circular enlargement 27 is arranged. WVith the latter the part 28 of the slot communicates which has approximately the same width as 25. f

In the part 28 of the slot a .U-shaped supporting member 29 is fixed by means of pins 30. On a pin 31 fixed to the supporting mem ber 29 a swinging arm 32 is fulcrumed and a disk 34 is turnable about the axle 33. The swinging arm 32 and the disk 34 are linked to each other by a pair of links 35. The swinging arm 32 is so acted upon by a spring 36 that the links 35 tend to turn the disk 34 in a clockwise direction when looking at Fig. 1 when the pin 37 connecting the links 35 to the disk 34 is situated below the axle 33.

The disk 34, which is prevented from webbling by insertions 38 placed bet-ween the two parallel shanks of the supporting member 29, is provided with an aperture 40 ending in a slot 39 and carries a knife 41 pro vided with a cutting edge 41' and placed on the slot 39 and acting as a clamping member in cooperation with the disk 34. In its position in readiness for action the aperture 40 is in alignment with the sleeve 42 through which the thread 7'' passes; the end of the sleeve which projects into the enlargement- 27 is in front of the disk 34. The latter is provided with cams 43 and 44 arranged approximately diametrically opposite each other. One of the cams, i. e. the cam 43, projects into the depression provided on the upper surface of the shuttle and the other cam 44 projects into the depression 46 provided on the lower surface of the shuttle. However neither of the cams 43 and 44 projects beyond the upper surface or the lower surface respectively of the shuttle body. The bottoms of the depressions 45, 46 extend at right angles to the longitudinal direction of the shuttle, they are parallel to each other and somewhat inclined towards the horizontal (Fig. Thethread f wound oil the bobbin 21 is guided by the velvet lining 24 and i the slot 25 towards the bore 26 from where warp threads occurs which leads to the formation of flaws, a narrowing of the shed oc curs as the broken thread can no longer carry out the same movements as'the other warp threads. When the shuttle is passed through the shed the warp threads forming the narrowed shed boar either from above or from below on the shuttle depending on whether the entanglement of the threads is higher or lower than the tip of the shuttle As soon i as the threads forming the flaws are sufiicient- 1y tensioned by the tension of the cloth beam they act on the cams 43 or 44 in such a manner that the disk 34 is turned. The cams can only effect a partial turning of the disk so far until the links 35 have passed their dead centre position. Thereby the spring 36 is compressed. Thereupon the disk 34 is fur ther turned by the compressed spring 36.

During the turning movement of the disk 34 the thread enters the slot 39 whereby it is placed between the disk 34 and the cutting edge 41 of the knife 41. WVhen the shuttle moves further the thread breaks immediately at the cuttingv position sothat in case the loom is not suddenly stopped, for instance by a stop motion device, a formation of flaws is prevented as the delivery ofthe weft thread ceases.

In the second constructional example illustrated in Figs. 6'11 the U-shaped supporting member is fixed by means of pins 54 in the slot 53 joining to the well 51 for housing the bobbin 52 A swinging arm 56 is fulcrumed at a pin fixed to the sup porting member 50 and about an axle 57 mounted in the latter a disk 59 is turnable and laterally guided by its bosses 58. The links 60 consisting of two parallel bars are connected at their one ends to the arm 56 and at their other ends to the disk59 by means of distancing bolts 61, 61 the latter passing through an aperture 62 of the disk 59. The swinging arm 56 is acted upon by a leaf spring 63. The latter tends to press the bolts 61, 61 into the rounded off corners 65, 65 of the aperture 62 arranged laterally of the beak 64, thereby the disk 59 is held in its position in readiness for operation. 66 denotes an aperture for the passage of the thread to which join the slots 67 and 67, covered by the double knife 68 having cutting edges 68 (Fig. 10) and acting as a clamping member in as much as the cutting edges 68 are resiliently pressed against the face 69 of the disk 59. The cams 70, 71 project in the upward and downward direction respectively into depressions 7 2, 73 provided on the shuttle and extending at right angles to the longitudinal direction of the latter, parallel to each other and inclined towards the horizontal.

lVhen the shuttle passes a narrowed part of the shed and the threads of the latter enter into one of the depressions 72 or 7 3 respectively the threads tensioned by the cloth beam act on the cams and cause a turning of the disk 59 and of the links 60 to such an extent that one of the distancing bolts 61 or 61 respectively comes to bear above or below the beak 64 depending on the direction in which the disk 59 is turned. In consequence thereof the disk 59 is turned by the action of the spring 63 so far that the edge of the aperture 62 comes to bear on the other distancing bolt, whereby the turning motion of the disk 59 and of the links 60 ceases.

Upon the turning of the disk 59 the thread f gets into one or the other of the slots 67, 67 and simultaneously between one of the flaps 69 and the cutting edge 68 resiliently pressed against the former and is partly cut by the cutting edge. This position of the parts is illustrated in Fig. 9. When the shuttle moves on the thread breaks on the partly cut position, the further supply of the weft thread ceases and the formation of flaws is prevented.

In the first constructional example the disk bearing the cams can only be turned in one direction whilst in this constructional example the disk 59 can be turned in the clockwise and anti-clockwise direction by narrowed portions of the sheds and irrespective of whether the latter hear from above or from below on the shuttle; the device is released when the shuttle moves in one direction or in the opposite, direction.

The third constructional example illustrated in Figs. 12'14: differs from that described above in as much as the cams are not arranged on the disk which forms part of the cutting device. The disk 76, which is notcircular as in the previously described examples, and to which the link 7 5 is connected, is fixed on a hollow shaft 77, turnably mounted on pins 78. A cam disk 81 housed in a slot 79 of the shuttle 80 is arranged laterally of the disk 76 and is provided with the cams 82, 82. The aperture 83 of the disk 76 is covered by a two-armed knife 84: having cutting edges 84. The link is connected at its other end with the swinging arm 88 mounted in the U-shaped carrier member 85, the latter being filled by means of pins 86 in the longitudinal slot 87 of the shuttle 80. A spring 89 acts on. the swinging arm 88 so that the latter constantly presses the distancing bolts 90 of the link 75 against the inner edge of the aperture 91 of the disk 76 through which the bolts 90 pass.

If any of the cams 82, 82 is obstructed by a narrowed shed it causes through the intermediary of the hollow shaft 77 a turning of the disk 76, whereby the thread 7' which lies normally in the aperture 83, is forced between the disk and one of the cutting edges 84 and is partly cut thereby. When the shuttle continues its movement the thread breaks at the place where the knife edge acted upon it and the supply of the weft thread ceases and the formation of flaws is prevented.

The inclined position of the bottom of the depressions is of particular importance. Thereby it is prevented that slightly slack warp threads cannot cause a turning of the clamping and cutting members in as much as they rest on the edge of the depression even if they are sufficiently slack to contact with the shuttle.

I claim:

1. In a shuttle for weaving looms, in combination, means for clamping and cutting the weft thread, release means adapted to rend-er said clamping means operative, said shuttle being provided with depressions on its upper and lower surface, and said release means being arranged to project into said depressions in order to be acted upon by a slack warp thread placing itself into said depressions.

2. In a shuttle for weaving looms, in combination, means for clamping and cutting the weft thread, release means adapted to render said clamping and cutting means operative, said shuttle being provided with depressions on its upper and lower surface having their bottom inclined towards the horizontal, and said release means being arranged to project into said depressions in order to be acted upon by a slack warp thread placing itself into said depressions.

3. In a shuttle for weaving looms, in combination, means for clamping and cutting the weft thread, release means adapted to render said clamping and cutting means operative, said shuttle being provided with depressions on its upper and lower surfaces having their bottom inclined towards the horizontal and extending at right angles to the longitudinal axis of the shuttle, and said release means being arranged to project into said depressions in order to beacted upon by a slack warp thread placing itself into said depressions.

4. In a shuttle for weaving looms, in combination, means for clamping and cutting the weft thread, release means adapted to render said clamping and cutting means operative, said clamping and cutting means being arranged on said release means and the clamping being caused by a cutting edge covering an aperture in said release means through which the weft thread unwound from the bobbin passes, said shuttle being provided with depressions on its upper and lower surfaces, and said release means being arranged to project into said depressions in order to be acted upon by a slack warp thread placing itself into said depressions.

5. In a shuttle for Weaving looms, in corn bination, means for clamping and cutting the weft thread, release means adapted to render said clamping and cutting means operative, said release means including a turnable disk, a link connected to said disk, a spring acting upon said link and adapted tohold said disk in readiness for operation and to effect a turning of said disk after an initial turning has been caused by a slack warp thread, said shuttle being provided with depressions on its upper and lower surfaces, and said release means being arranged to project into said depressions in order to be acted upon by a slack warp thread placing itself into said depressions.

6. In a shuttle for weaving looms, in combination, means for clamping and cutting the weft thread, release means adapted to render said clamping and cutting means operative, said release means including a turnable disk, a link connected to said disk, a spring acting upon said link and adapted to hold said disk in readiness for operation and to efi'ect a turning of said disk after an initial turning has been caused by a slack warp thread, said turnable disk being provided with an aperture to which two slots oin, a knife forming part of said cutting means and provided with cutting edges covering said slots and forming clamping means for the weft thread passing through said aperture and between the disk and the cutting edges upon a turning of said disk, said shuttle being provided with depressions on its upper and lower surfaces, and said release means being arranged to project into said depressions in order to be acted upon by a slack warp thread placing itself into said depressions.

7 In a shuttle for weaving looms, in combination, means for clamping and cutting the weft thread, release means adapted to render said clamping and cutting means operative, said release means including a turnable disk, a link operatively connected to said disk, a spring acting upon said link and adapted to hold said disk in readiness for operation and to effect a turning of said disk after an initial turning has been caused by a slack Warp thread, said turnable disk being provided With an aperture, a beak on said disk, two pins on said link, said pins passing through said aperture and cooperating with said beak upon turning of said disk, said shuttle being provided with depressions on its upper and lower surfaces, and said release means being arranged to project into said depressions in order to be acted upon by a slack Warp thread placing itselfinto said depressions.

8. In a shuttle for Weaving looms, in combination, means for clamping and cutting the Weft thread, release means adapted to render said clamping and cutting means operative, said clamping and cutting means being arranged laterally of said release means and both means being mounted on a common shaft, said release means including a turnable disk, a link operatively connected to said disk, a spring acting upon said link and adapted to hold said disk in readiness for operation and to effect a turning of said disk after an initial turning has been caused by a slack Warp thread, said shuttle being provided With depressions on its upper and lower surfaces, and said release means being arranged to project into said depressions in order to be acted upon by a slack Warp thread placing itself into said depressions.

9. A shuttle for Weaving looms having Weft cutting means, and means arranged so as to be operable by a slack Warp thread bearing upon either the top or the bottom of the shuttle for actuating said Weft cutting means.

In testimony whereof I have signed my name to this specification.

FRIEDRICH KRUMPER. 

